RPM: use exact package names on requires

We currently build on EL7, Fedora 26 and Fedora 27.

On EL7, some of the Python packages are prefixed with "python2", and
some others are not.  We have been previously using the name of
"Provides" instead of the real package names.

Now, Python package names on Fedora 26 and Fedora 27 are the same for
those we depend on.

This adds a conditional block for EL7, and another one for Fedora 26
and 27.  Some Python packages have been kept on both blocks, in
preparation for the Python 3 packaging that will happen only for the
Fedora packages.
Signed-off-by: NCleber Rosa <crosa@redhat.com>

python-avocado.spec

@@ -41,20 +41,36 @@ Source0: https://github.com/avocado-framework/%{srcname}/archive/%{commit}.tar.g
 BuildArch: noarch
 BuildRequires: fabric
 BuildRequires: procps-ng
+%if 0%{?rhel} == 7
 BuildRequires: pystache
-BuildRequires: python-docutils
 BuildRequires: python-lxml
-BuildRequires: python-mock
-BuildRequires: python-psutil
-BuildRequires: python-requests
-BuildRequires: python-resultsdb_api
 BuildRequires: python-setuptools
-BuildRequires: python-sphinx
-BuildRequires: python-six
 BuildRequires: python-stevedore
+BuildRequires: python2-aexpect
 BuildRequires: python2-devel
+BuildRequires: python2-docutils
+BuildRequires: python2-mock
+BuildRequires: python2-psutil
+BuildRequires: python2-requests
+BuildRequires: python2-resultsdb_api
+BuildRequires: python2-six
+BuildRequires: python2-sphinx
 BuildRequires: yum
-BuildRequires: python-aexpect
+%else
+BuildRequires: pystache
+BuildRequires: python2-aexpect
+BuildRequires: python2-devel
+BuildRequires: python2-docutils
+BuildRequires: python2-lxml
+BuildRequires: python2-mock
+BuildRequires: python2-psutil
+BuildRequires: python2-requests
+BuildRequires: python2-resultsdb_api
+BuildRequires: python2-setuptools
+BuildRequires: python2-six
+BuildRequires: python2-sphinx
+BuildRequires: python2-stevedore
+%endif
 
 %if %{with_tests}
 BuildRequires: libvirt-python
@@ -70,10 +86,17 @@ Requires: gdb
 Requires: gdb-gdbserver
 Requires: procps-ng
 Requires: pyliblzma
+%if 0%{?rhel} == 7
 Requires: python
-Requires: python-requests
 Requires: python-setuptools
 Requires: python-stevedore
+Requires: python2-requests
+%else
+Requires: python2
+Requires: python2-requests
+Requires: python2-setuptools
+Requires: python2-stevedore
+%endif
 
 %if 0%{?fedora} >= 25
 BuildRequires: kmod
@@ -472,6 +495,7 @@ Again Shell code (and possibly other similar shells).
 - Remove backward compatibility with name avocado
 - Remove hack to workaround fabric bugs on Fedora 24
 - Use real package name for python YAML package on EL
+- Use exact package names on requires
 
 * Wed Feb 28 2018 Cleber Rosa <cleber@redhat.com> - 59.0-0
 - New upstream release